18 OZ, Heavy Duty, Aerosol Rubberized Undercoating, Produces A Textured Finish Which Resists Chipping, Abrasion, Exterior Rusting & Weathering, Provides 1 Coat Build Up With No Dripping, Running, Or Sagging, 1 Coat Seals Wheel Wells & Under Carriage, Tree Wounds, Posts, Roofs & Gutters, Offers Sound Deadening Properties, Non-Paintable, Asphalt Based.